Mark Zuckerberg, the Facebook chief executive, warned on Tuesday of an online propaganda “arms race” with Russia and vowed that fighting interference in elections around the world is now his top priority. The 33-year-old billionaire, during testimony that lasted nearly five hours, was speaking to Congress in what was widely seen as a moment of reckoning for America’s tech industry. (The Guardian) Meanwhile, here are five key takeaways from the Facebook founder’s Senate appearance. (Newsweek)

The London offices of Rupert Murdoch’s entertainment empire 21st Century Fox have been raided by investigators, according to reports. European Commission investigators reportedly seized documents and computer records from the company’s offices in Hammersmith, west London, on Tuesday. Fox Networks Group, a unit of Mr Murdoch’s firm, said it was cooperating fully with the competition watchdog’s inspection. It said the precise nature of the confidential investigation, which is believed to be in its early stages, was unclear. (Evening Standard)

A 205 million-year-old prehistoric reptile bone found on a beach in England belongs to "one of the largest animals" that ever lived, according to an international team of researchers. The jaw bone comes from a giant ichthyosaur that experts estimate may have measured up to a whopping 26 meters (85 feet) long—approaching the size of some blue whales, the largest animal ever known to exist. (Newsweek)